11 research outputs found

    Host plant evaluation behaviour of Bemisia tabaci and its modification by external or internal uptake of imidacloprid

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    The behaviour of adult Bemisia tabaci Gennadius (Homoptera: Aleyrodidae) was observed on leaves of cotton, Gossypium hirsutum L., to study the process of host plant evaluation. Seven distinct behavioural elements were identified and recorded for a period of 20 min after initial contact with leaves. The behaviour of the whiteflies was observed on untreated leaves or on leaves treated with either foliar or systemically applied imidacloprid. Thus, contact with imidacloprid by whiteflies was either via the external cuticle or by ingestion, allowing determination of the effect of uptake route on host evaluation behaviour. Analysis of behavioural sequences and comparison of latencies, frequencies and durations of elements of behaviour between treatments revealed that host evaluation behaviour was similar on untreated and foliar treated leaves, but markedly different on those treated systemically. After their first probe, whiteflies on systemically treated leaves were much more active, spending significantly greater time walking and dabbing the labium tip onto the leaf surface. There was also a 50% reduction in the total time spent probing into systemically treated leaves, compared to the other treatments. This effect was the result of a shorter mean probe duration, and no effect of treatment was found on the frequency of probing. Pre-oviposition behaviour was significantly more common on the systemically treated leaves, although the number of eggs laid was similar on all treatments. These results also show that the host evaluation phase of adult female B. tabaci was dominated by probing. The behavioural sequence that leads to probing was affected significantly by imidacloprid when ingested, but not by direct contact with this compound on the leaf surface. The wider implications for the mechanisms of whitefly-host plant interactions are discussed

    Opportunities for independent living using direct payments in mental health

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    Mental health service users have yet to reap the benefits of greater choice, control and independent living, which direct payments have facilitated in other groups of community care users, particularly people with physical disabilities. To redress this imbalance a national pilot to promote direct payments to people with mental health needs in five local authority sites across England was set up and evaluated. The evaluation used a multi-method approach incorporating both qualitative and quantitative data, including individual semi-structured interviews and group discussions with key stakeholders across the pilot sites. This article draws on findings from the pilot evaluation to provide a preliminary understanding of how applicable the independent living philosophy is to mental health and what opportunities direct payments offer for service users. When given the opportunity, service users were able to use direct payments creatively to meet a range of needs in ways which increased their choice, control and independence. This suggests that the benefits of greater independent living through direct payments may be realisable in mental health. However, a number of ways in which the principles of direct payments in mental health could be ‘downgraded’ were identified. The evaluation results indicate that a thorough understanding of the independent living philosophy needs to be developed in the context of mental health

    Rehabilitation von Erkrankungen des zentralen Nervensystems

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    Tactile reception and behavior of fish

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